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Law of Conservation of Energy

A box of mass...

Question

A box of mass $1 k g$ is pulled on a horizontal plane of length $1 m$ by a force of $8 N$ then it is raised vertically to a height of $2$ m, the net work done is:

28 J

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8 J

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18 J

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none of the above

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Solution

The correct option is B 28 J
$W = m g h + F S = 1 (10) (2) + 8 \times 1 = 20 + 8 = 28 J$

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